Boring-machine and cutter therefor.



J. C MARRZGTT. mama mom AND CUTTER THEREFOR. 1 '7 APPLICATION FILED 0073.4, 1906; m

Patented Elan 16, 1909.

2 SEEBTS-SHEET 1.

r J. G. MARRIOTT. I BORING HAUHINE AND U'JTTEF. THEREFOR,

APPLIUJQTIOH FILED OUT-, 1908.

Patented mar. 16, E999.

sauna-sum 2. v

.gDorp, ,Staten Island, in the county of Richcompact, easily operated and adaptable for {1 r p I core. Figs. i, o, 6, 7, 8, 9, and it), are views simplify machines for boring holes of non- JAMES C. MARRIOTT, OF

NEW DORP, new Yon-K.

BORING-MCHINE AND CUTTER THEREFOR.

No.91i5,301.

Application filed Gctober 4, 1906. Serial No. 337,440,

To all whom it may concern: 1

Be. it known that I, JAMES C. ll/IARRIOTT, a citizen of the United States, residing at New r mend, city of New York, and State of New York,,have invented certain new and useful Improvements in Boring-Machines and Cutters Therefor; and I do hereby declare the following to be a full, clear, and eXact description of the same, such as will enable others skilled in the art to which it appertains to make and use the same.

llly invention relates to, improvements in boring machines, and comhrises what may he termed a universal boring machine; that late say, a machine adapted to bore holes of many difierent cross sections. The machine herein described is particularly intended for boring square and like holes; but by changin the cutters it may be adapted for boring ho es of round, elliptical, and various other sections.

My invention consists in the novel construction of the boring machine; in the novel cutters employed; andin various other fea tures hereinafter described andparticularly pointed-out in the claims.

The objects of my invention are, to provide a boring machine capable of boring at will, holes of great variety of cross sections, ranging from circular to square and other non-circular cross sections, capable of generation by a rotary cutter; to improve and circular cross section; and generally to make the improved-boring machine simple,

boring holes of a great variety of cross sections.

I-will now lroceedto describe my invennovel features in claims.

In thesaid drawings: F' ure 1 shows an end elevation of m said oring machine, the cuttersthereof eing shown in section. Fig. .2 shows a side elevation and partial sec tionofsuch boring machine. Fig. 3 shows a horizontal transverse section through the axis of the cutters, which latter are shown within a hole such as they are adapted to Specification of Letters Patent.

Fatented March 1e, race.

employed.

my boring machine, one or more rotary cut 1 similar to Fig. 3, except. that the cutters are 58 lshown in section, illustrating other forms and constructions of cutters, which may be.

ting sections, consisting of horizontally ro'-' tating bits, or spindles provided with cutting edges adapted to rotate about an axis which is one of the axes of the cross section of the hole to be bored. In the case of a hole of square or like section this axis of rotation of the bit forms, preferably, one of diagonals of such square; in the case of an elliptical hole it forms preferably, the major axis of the ellipse, and in every'ease the form of the bit and the location of its axis are such that said bit rotating about said axis will cut a hole of the desired cross section. I

For the purpose of illustration I will first describe my boring machine as adapted for boring holes of square cross section. For this purpose reference will be made to Figs. 1, 2 and 3. In said figures, numeral 1 designates a bit comprising two conical sections, mounted upon a shaft 2, the axis of which is a lineconnecting the apices of said cones, said shaft mounted in a bearing in a strut or brace 3, said shaft also carrying a sprocket wheel 4. Said strut or brace is provided with convenient means for holding it steady and for pressing down to cause the bit to feed. I have shown for this purposea breast piece 5 and a handle 6. It is further provided with bearings for a sprocket wheel 7 in line with sprocket wheel 4-, and with means for rotating said sprocket wheel 7, as for example,

crank handle 8, and a sprocket chain 9 con necting sprocket wheels 4 and 7 and serving to drive wheel 4 and therefore to drive the bit 1. By reference to Fig. 2 it will be seen that the axis of rotation of bit 1 is one of the d-iagonalsof the hole to be bored. The apices of the bit 1 will obviously out well into two corners of .the hole to be bored, forming sharp corners; but since the bases of the two sections cannot come together (they must be separated by a slot through the strut 3 and the sprocket chain 9 pass), in order to cut the other two corners or the hole I provide cer- I In order to adapt the machine for out 10 size o fisprocltet wheel 4.

50 in two or more set-tionsconnected 55 bit, or being otherwise secured stitute another hit and sprocket wheel. The

strut 3 is provided with a telescopic adjustnie'nt, as indicated at 11, to permit adjustmen) of the distance between the sprocket wheels stand 7 necessitated by variation of Each cutter sertionyiinay also be made in sections, so thatwi th one pair of end sections, and various intermediate sections and sprocket wheels, the deviceniay be adjusted for holes of di tierwhich] i are the end sections, and 1 intermediate sections, connected to end sections 1, 1,,by screws 12 and dowels 13, as shown.

Fig. 5 illustrates a cutter 14, adapted to cut hexagonal holes. In this case the teeth 10 of the ehain have straight faces, as shown.

Fig. 6 shows a cutter of elliptical crosssection (the section being taken through the axis of rotation) adapted for cutting elliptical holes. Fig. 7 shows a similar cutter for cutting circular holes.

When cutting holes of square, hexagonal, or like angular cross-section, instead of using .a cutter wnich will cut clear-into the corners,

, as shown in Figs. 15 inclusive, 1 may use a cutter which will form rounded corners, as shown in Fig. 8, This will permit more rapid cutting, and is permissible in most cases. Or, as shown in Fig. 9, l ma use a bit lforming rounded corners, and teeth 10 on the chain lin'hs forming sharp corners, and after the holehas been bored, may withdraw the machine from the hole, turn it around a 4 quarter turn, and run it down through the hole again, the V-shapcil teeth of the chain cleaning out rapidl the rounded corners left by the rounded bits 1. a

It will be seen that my universal boring;-

machine is adapted for boring in one operation a hole of any cross-section which has an .axis of symmetry without angles recnterinc longitudinally upon such axis.

It is not necessary that the bits be formed together. instead, the hit may be entirely in one piece, as shown in Fig. U), the sprorlt t wheel being formed iutwo parts, so as to be capable of being passed over the central portion of the to said bit, or being east on.

What I claim is 1 1. A cutter for a boring machine of the class'described, consisting ol" a hit of any V8:

riety of shape, revolving on a horizontal axis, which is the longest axis oi symmetry of the hole to be cut.

2. A boringmachine consisting of the strut 3 in which is journalcd the shaft 2, the cl axial cross-section of said cutter, a brace for prising a' chain and provnled with teeth for cuttmg'across 120 which is the longest axis of syniinetii oithe hole to be cut, the bit l-inounted on said shaft, and cutting teeth 10, mounted on the chain 9 and adapted to cut around said chain and bearings, and means for driving said chain and shaft.

In a boring machine, a cutter consisting of one or more bits revolving about an axis which constitutes the longest axis of symn'ictry of a cross-section of the hole to be cut, bearings for said bits, and means for driving the same, and a cutting chain cutting around said bearings and driving mechanism.

4. A boring machine of the class described, comprising a rotary cutter havin r tapering cutting portions arranged base to Miss upon an axis of rotation adapted to form an axis of symmetry of the cross-section of the hole to be cut, and means for holding said cutter and for rotating the sain e.

A boring machine of the class described, comprising a rotar; cutter having tapering cutting portions arranged base to base upon an axis of re 'u-tion, connecting corners of the axial cross-section of said cutter, and means for holding said cutter and for rotating the same. f

, 6. A boring machine of theclass described,

comprising a'rotary cutter having?) tapering cutting portions arranged base to .ase upon an axis of rotation connecting corners of the axial cross-section of saidcutter, a brace for,

holding the cutter, projecting through a space between said cutting ortions, and

means for rotating the cutterli ewise passingthrough said space.

7. A boringmachine oi the class described, comprisiiu, a rotary cutter having tapering cutting portions arranged base to base upon an axis of rotation connecting corners of the axial cross section of said cutter, a brace for holding the cutter, projecting through a space between said cutting portions, and, a sprocket chain likewise passing through said space ndsprociiet wheels driving Sitifilfihfilll and for driving said cutter from aiu'chain.

8. A boring machine of the class described, comprising a rotary cutter havini tapering cutting portions arranged base to use upon an axis of rotation connecting corners of the holding said cutter projecting through a space between said cutting portions, and

sprocket gearing for driving said cuttercompassing through Said space th same.

9. A boring machine of the class described, comprising in combination a rotary cutter having tapering cutting portions and driving means for said cutter passing througlra space 125 between said cutting portions and provided with cutting means completing the outline of the said tapering cutting portions, and ardriving means for said cutter passing through a space between said cutting portions and comprising a drive chain provided with cutting means completing the outline of the cross-section of the hole to be cut, and arranged to cut across the gap between said tapering cutting portions, said cutter arranged to rotate about an axis of rotation adapted to form an axis of symmetry of the cross-section of thehole to be cut.

11. A cutter for a boring machine of the class described, comprising twin tapering cutting portions, having cutting edges from base to apex, and arranged base to base upon a common axis.

12. A cutter for a boring machine of the class described comprising twin composite tapering cutting sections, each comprising an end piece and an intermediate piece or pieces secured together, said cutting sections arranged base. to base upon a common axis.

13. A cutter for a boring machine of the class described, consistin of a bit revolving on a horizontal axis, Whic is the longest axis of symmetry of the hole to be cut, said bit comprising an end piece and one or more other pieces secured together.

14. A cutter for a boring machine of the class described, comprising twin taperin cutting portions, each comprising a toothe 90 cone said cones arran ed base to'base vupon a common axis.

15. A cutter for a boring machine of the class described comprising twin tapering cutting portion, each comprising a 90 cone provi ded with cutting edges, said cones arranged base to base upon a common axis, with a space between and provided With'bearing and driving means in said space.

In testimony whereof I afiix my signature, in the presence of two witnesses.

JAMES o. MARRIOTT.

Witnesses ROGER H. LYON, H. M. MARBLE. 

